[dpdk-dev] [PATCH v2] vhost: fix missing null dev pointer check

[Xia, Chenbo]

> -----Original Message-----
> From: Fu, Patrick <patrick.fu at intel.com>
> Sent: Thursday, July 16, 2020 11:38 PM
> To: dev at dpdk.org; maxime.coquelin at redhat.com; Xia, Chenbo
> <chenbo.xia at intel.com>
> Cc: Fu, Patrick <patrick.fu at intel.com>
> Subject: [PATCH v2] vhost: fix missing null dev pointer check
> 
> From: Patrick Fu <patrick.fu at intel.com>
> 
> This patch adds the check of dev pointer in vhost async enqueue completion poll.
> If a NULL dev pointer detected, the poll function returns immediately.
> 
> Coverity issue: 360839
> Fixes: cd6760da1076 ("vhost: introduce async enqueue for split ring")
> 
> Signed-off-by: Patrick Fu <patrick.fu at intel.com>
> ---
> v2:
>   - change fixline number
> 
>  lib/librte_vhost/virtio_net.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c index
> 1d0be3dd4..235c31e28 100644
> --- a/lib/librte_vhost/virtio_net.c
> +++ b/lib/librte_vhost/virtio_net.c
> @@ -1635,6 +1635,9 @@ uint16_t rte_vhost_poll_enqueue_completed(int vid,
> uint16_t queue_id,
>  	uint16_t start_idx, pkts_idx, vq_size;
>  	uint64_t *async_pending_info;
> 
> +	if (!dev)
> +		return 0;
> +
>  	VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
>  	if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
>  		VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
> --
> 2.18.4

Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>